I'm unable to enter CMOS setup.
Question
I'm unable to enter CMOS setup.
Answer
Before following the below steps, make sure you're attempting to
enter CMOS setup properly.
If you're pressing the correct key (as mentioned in the above link) to enter CMOS setup and are still unable to enter setup, try the suggestions below.
Cause a stuck key
Most computers will generate an error if it detects a stuck key as the computer is booting up and will enable you to easily enter CMOS setup after the error. To cause this error, hold down one key on the keyboard as the computer is booting up. After the error. press the key it's asking for to enter setup. If you do not get an error, or pressing the key to enter setup still does not work, continue with the other suggestions below.
Use a PS2 keyboard
In some situations if you're using a USB keyboard, your computer may not recognize the keyboard when it first starts up. To help verify this is not the cause of the issue, try using a PS2 keyboard instead.
Use an alternate keyboard
If this is a PS2 keyboard, there is a possibility that it could also be a bad keyboard. Make sure the keyboard you're using is not defective by trying an alternate keyboard with the computer.
Corrupt BIOS / CMOS
In some situations the CMOS may become corrupt and be encountering issues that prevent it from successfully entering setup. Try resetting your CMOS using the motherboard jumper or dipswitch CMOS reset. Unfortunately, because all motherboards are different, the steps on how to do this can only be found through your motherboard manufacturer's documentation.
Defective hardware
If after following the above steps you're still unable to enter CMOS setup, it's likely you're encountering a hardware defect. At this point we'd suggest first removing all hardware from the motherboard. Disconnect all external expansion cards except video, hard disk drive, CD-ROM or other disc drives, floppy drive, etc. Once disconnected, turn on the computer and enter CMOS setup. If in this stripped down state you're still unable to enter CMOS setup, unfortunately the motherboard is bad and will need to be replaced.
Additional information
- See the CMOS definition for further information and related links.